參數(shù)資料
型號(hào)： LMP91000SDX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO14
封裝： LLP-14
文件頁(yè)數(shù)： 1/24頁(yè)
文件大?。?/td> 696K
代理商： LMP91000SDX
LMP91000
September 6, 2011
Sensor AFE System: Configurable AFE Potentiostat for
Low-Power Chemical Sensing Applications
General Description
The LMP91000 is a programmable Analog Front End (AFE)
for use in micro-power electrochemical sensing applications.
It provides a complete signal path solution between a sensor
and a microcontroller that generates an output voltage pro-
portional to the cell current. The LMP91000’s programmability
enables it to support multiple electrochemical sensors such
as 3-lead toxic gas sensors and 2-lead galvanic cell sensors
with a single design as opposed to the multiple discrete so-
lutions. The LMP91000 supports gas sensitivities over a
range of 0.5 nA/ppm to 9500 nA/ppm. It also allows for an
easy conversion of current ranges from 5A to 750A full
scale.
The LMP91000’s adjustable cell bias and transimpedance
amplifier (TIA) gain are programmable through the the I2C in-
terface. The I2C interface can also be used for sensor diag-
nostics. An integrated temperature sensor can be read by the
user through the VOUT pin and used to provide additional
signal correction in the C or monitored to verify temperature
conditions at the sensor.
The LMP91000 is optimized for micro-power applications and
operates over a voltage range of 2.7V to 5.25V. The total cur-
rent consumption can be less than 10
μA. Further power sav-
ings are possible by switching off the TIA amplifier and
shorting the reference electrode to the working electrode with
an internal switch.
Features
Typical Values, T
A = 25°C
■ Supply voltage
2.7 V to 5.25 V
■ Supply current (average over time)
<10 A
■ Cell conditioning current up to
10 mA
■ Reference electrode bias current (85°C)
900pA (max)
■ Output drive current
750A
■ Complete potentiostat circuit to interface to most chemical
cells
■ Programmable cell bias voltage
■ Low bias voltage drift
■ Programmable TIA gain
2.75k
to 350k
■ Sink and source capability
■ I2C compatible digital interface
■ Ambient operating temperature
-40°C to 85°C
■ Package
14 pin LLP
■ Supported by Webench Sensor AFE Designer
Applications
■ Chemical species identification
■ Amperometric applications
■ Electrochemical blood glucose meter
Typical Application
30132505
AFE Gas Detector
2011 National Semiconductor Corporation
301325
www.national.com
LMP91000
Sensor
AFE
System:
Configurable
AFE
Potentiostat
for
Low-Power
Chemical
Sensing
Applications
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